I can't speak for Boron as an individual ingredient, but many people here run it as a staple supplement. If you check out the staple thread started a free days ago and one started a free months ago, you'll see those that do. You could PM on of them.
There is a reason why it is included in many popular test boosters/natural anabolics. There have been clinical studies that show 10mg of Boron decrease SHBG levels. It is one reason why, along with bone health, that is is used in AlphaMax XT. I have used AlphaMax XT and can say that I have noticed a decrease in estrogen, but there are other ingredients that come into play as well.
https://www.ncbi.nlm.nih.gov/pubmed/21129941
EDIT - my bad. I thought this was a different study, same as the first one posted above.